WOLFRAM SYSTEM MODELER

OpenCenterHydraulicSystem

Example circuit with a pump that unloads to a reservoir when inactive

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Examples.Rotation.OpenCenterHydraulicSystem"]
Out[1]:=

Information

This example shows three motors that are driven by a pump. Each motor has a different load. The open center valves direct pump flow to a reservoir when no motors are running. This means that the pump will not have to run constantly at the relief valve setting.

Fig. 1 shows how the three control valves are opened and then closed one after another. Fig. 2 shows how the motors start to spin and then stop when the corresponding valve is opened and closed. Fig. 3 shows how the open center design succeeds in reducing pump torque when no motor is used.

openCenterHydraulicSystemPlot1
Fig. 1 Control valve opening states

openCenterHydraulicSystemPlot2
Fig. 2 Motor speeds

openCenterHydraulicSystemPlot3
Fig. 3 Pump torque

Parameters (1)

medium

Value: Oil()

Type: Medium

Description: Medium in the component

Components (36)

medium

Type: Medium

Description: Medium in the component

tank5

Type: Tank

Description: Simple tank with constant pressure

tank6

Type: Tank

Description: Simple tank with constant pressure

pump

Type: Pump

Description: Model of a pump with fixed displacement and volumes

volume1

Type: Volume

Description: Fixed volume with fluid storage

constantSpeed

Type: ConstantSpeed

Description: Constant speed, not dependent on torque

pressureReliefValve

Type: PressureReliefValve

Description: Pressure valve, controlled by the pressure difference between the ports

controlValve2

Type: PCVE63

Description: Electrically actuated proportional control valve with six ports and three states

const2

Type: Constant

Description: Generate constant signal of type Real

tank1

Type: Tank

Description: Simple tank with constant pressure

const3

Type: Constant

Description: Generate constant signal of type Real

controlValve3

Type: PCVE63

Description: Electrically actuated proportional control valve with six ports and three states

const1

Type: Constant

Description: Generate constant signal of type Real

controlValve1

Type: PCVE63

Description: Electrically actuated proportional control valve with six ports and three states

volume2

Type: Volume

Description: Fixed volume with fluid storage

volume3

Type: Volume

Description: Fixed volume with fluid storage

tank2

Type: Tank

Description: Simple tank with constant pressure

tank3

Type: Tank

Description: Simple tank with constant pressure

tank4

Type: Tank

Description: Simple tank with constant pressure

motor1

Type: Motor

Description: Model of a motor with fixed displacement and volumes

inertia1

Type: Inertia

Description: 1D-rotational component with inertia

speedSensor1

Type: SpeedSensor

Description: Ideal sensor to measure the absolute flange angular velocity

speedSensor2

Type: SpeedSensor

Description: Ideal sensor to measure the absolute flange angular velocity

inertia2

Type: Inertia

Description: 1D-rotational component with inertia

motor2

Type: Motor

Description: Model of a motor with fixed displacement and volumes

speedSensor3

Type: SpeedSensor

Description: Ideal sensor to measure the absolute flange angular velocity

inertia3

Type: Inertia

Description: 1D-rotational component with inertia

motor3

Type: Motor

Description: Model of a motor with fixed displacement and volumes

singlePulse1

Type: SinglePulse

Description: Model that generates a single pulse signal of type Real

gain1

Type: Gain

Description: Output the product of a gain value with the input signal

gain2

Type: Gain

Description: Output the product of a gain value with the input signal

singlePulse2

Type: SinglePulse

Description: Model that generates a single pulse signal of type Real

singlePulse3

Type: SinglePulse

Description: Model that generates a single pulse signal of type Real

gain3

Type: Gain

Description: Output the product of a gain value with the input signal

constantTorque3

Type: ConstantTorque

Description: Constant torque, not dependent on speed

constantTorque2

Type: ConstantTorque

Description: Constant torque, not dependent on speed